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Poland (FA(3)): Additional Document Reference

You can provide multiple order numbers in Polish FA(3) documents.

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In Polish KSeF FA(3) transactions, it is possible to provide multiple order numbers and their corresponding dates on the document level, while the UBL format only allows for one element cac:OrderReference.

In order to still be able to accommodate all additional related order numbers, the repeatable Additional Document Reference element can be used.

Elements

Name (Path)CardinalityDescription
Additional Document Reference (Invoice/cac:AdditionalDocumentReference)0..nA group to provide references to a document. In this case, to provide a reference to additional order numbers.
Additional Document Identifier (cbc:ID[schemeID='ON'])1..1An identifier of the referenced document. In this case, the order number. Use schemeID='ON'.
Additional Document Date (cbc:IssueDate)0..1The date of the referenced document. In this case, the order date.

Example: Providing three order numbers on the document level

<ubl:Invoice>
    <!-- Code omitted for clarity -->
    <!-- First order number -->
    <cac:OrderReference>
        <cbc:ID>000373824</cbc:ID>
        <cbc:IssueDate>2026-01-08</cbc:IssueDate>
    </cac:OrderReference>
    <!-- All additional order numbers -->
    <cac:AdditionalDocumentReference>
		<cbc:ID schemeID="ON">000373854</cbc:ID>
		<cbc:IssueDate>2026-01-08</cbc:IssueDate>
	</cac:AdditionalDocumentReference>
    <cac:AdditionalDocumentReference>
		<cbc:ID schemeID="ON">000373855</cbc:ID>
		<cbc:IssueDate>2026-01-08</cbc:IssueDate>
	</cac:AdditionalDocumentReference>
    <!-- Code omitted for clarity -->
</ubl:Invoice>

Updated about 2 hours ago